Help with functions and Graphing

Hello Im am having issues calculating the sum Av dB. And Graphing this frequency rersponse of my filter. Its suppuse to be a chebyshev filter but, its just flat-lining.

%Gain
N_freq = length(fs);
Av_k = zeros(N_freq,N_Stages);


%Gain
N_freq = length(fs);
Av_k = zeros(N_freq,N_Stages);


N_freq = length(fs)
Av_k = zeros(N_freq,N_Stages);


for kk =1:N_Stages;
    [Av_kk] = EE322_TF(fs,G_new,C_new);
    Av_k(:,kk)= Av_kk;
end
%Total Gain
Av_k_dB = 20*log(Av_k);
Av_db = sum(abs(Av_k_dB))

figure()
freqz(Av_db,100,fs)
%}

%-----------------------------------------------------------------------
function [Av_kk] = EE322_TF(fs,G_new,C_new); 
    s=j*2*pi*fs;
    
    G1=G_new(1);
    G2=G_new(2);
    G3=G_new(3);
    
    
    C1=C_new(1);
    C2=C_new(2);

    A0=-G1*G3;
    B2= C1*C2;
    B1=(G1+G2+G3)*C2;
    B0=(G2*G3); 
    [Av_kk]= (A0)/(B2.*s^2+B1.*s + B0);
end